Polyol compositions for hot melt adhesives

Abstract

Disclosed are polyether and polyesters polyol condensations. The polyols are uniquely suited for ease of manufacture and improved adhesive characteristics particularly for low surface energy materials. The materials can be used in urethane adhesives.

I claim: 
     
       1. A method for the synthesis of a capped polymeric polyol, the method comprising the steps of:
 (a) combining a polyester polyol, having a molecular weight greater than 500, the polyol comprising a starter compound and repeating units of an alkylene oxide, with a glycidyl ester compound at a ratio of one glycidyl compound per each active hydroxyl group in the polymeric polyol, to form a mixture, wherein the glycidyl compound comprises a glycidyl ester, wherein the glycidyl ester comprises a carboxylic acid ester having at least 5 carbon atoms; and 
 (b) reacting the mixture to form a capped material. 
 
     
     
       2. A polyester polyol compound comprising a polyester polyol having a molecular weight greater than 500 with at least one end cap formed from a reaction of an active hydrogen in the polyester polyol with a glycidyl compound, wherein the glycidyl compound comprises a glycidyl ester, and wherein the glycidyl ester comprises a carboxylic acid ester having at least 5 carbon atoms. 
     
     
       3. The polyester polyol compound of  claim 2 , wherein the polyester polyol comprises a substantially linear aliphatic polyester. 
     
     
       4. The polyester polyol compound of  claim 3 , wherein the aliphatic polyester comprises the polymerization as esterification reaction product of a dicarboxylic acid and a diol. 
     
     
       5. A polyester polyol compound comprising a polyester polyol having a molecular weight greater than 500 with at least one end cap formed from a reaction of an active hydrogen in the polyester polyol with a glycidyl compound, wherein the glycidyl compound comprises a glycidyl ester and wherein the glycidyl ester comprises a carboxylic acid ester having 5 to 20 carbon atoms. 
     
     
       6. The polyester polyol compound of  claim 5  wherein the glycidyl ester comprises a compound of formula: 
       
         
           
           
               
               
           
         
         wherein, R6 and R7 are linear or branched hydrocarbyl or alkyl groups having from about one to about 20 carbon atoms. 
       
     
     
       7. The polyester polyol compound of  claim 6  wherein the total carbon content of the branched alkyl group of the acid group of the glycidyl ester is such from about 9 to about 15 carbon atoms. 
     
     
       8. A polyurethane adhesive material comprising an isocyanate compound and a glycidyl capped polyester polyol, wherein the glycidyl capped polyester polyol having a molecular weight greater than 500 with at least one end cap formed from a reaction of an active hydrogen in the polyester polyol with a glycidyl compound, wherein the glycidyl compound comprises a glycidyl ester, and wherein the glycidyl ester comprises a carboxylic acid ester having 5 to 30 carbon atoms. 
     
     
       9. The polyurethane adhesive material of  claim 8  wherein the isocyanate compound is MDI. 
     
     
       10. The polyester polyol of  claim 2 , wherein the polyester polyol is reacted with the glycidyl compound at a molar ratio of hydroxyl:carboxyl groups is about 1.1:1 to 0.9:1. 
     
     
       11. The polyester polyol of  claim 2 , wherein the polyester polyol is reacted with the glycidyl compound at a molar ratio of hydroxyl:carboxyl groups is about 1.2:1 to about 0.8:1. 
     
     
       12. The polyester polyol of  claim 3 , wherein the substantially linear polyester polyol has an acid number equal to or less than about 2. 
     
     
       13. The polyester of  claim 3 , wherein the substantially linear polyester polyol has a hydroxyl number equal to or greater than 10. 
     
     
       14. The polyester polyol of  claim 2 , wherein the polyester polyol has a molecular weight of about 1000 to about 16000. 
     
     
       15. The polyester polyol of  claim 2 , wherein the polyester polyol has a molecular weight of about 2000 to about 4000. 
     
     
       16. The method of  claim 1 , wherein the glycidyl ester comprises a carboxylic acid ester having 5 to 30 carbon atoms.